There is no such thing as an "accurate" ranking without a specific definition of what is allegedly being measured. Since not all law students desire the same things out of their law schools, there will never be a universally-applicable accurate ranking of schools in the order that you should attend them. However, there is much data available regarding the qualities of law schools that may be of interest to individual applicants, and often this data is presented in such a way to be a convenient basis for ordinal ranking. For example, students who want elite firm jobs may look at studies that rank law schools based on the average firm rank of recent employers, or may consult the NALP directory to see the number of elite firms that recruit on campus. Students seeking academic positions may look at a certain famous Longhorn's rankings of academics produced per-capita, or may find data on federal court clerkship rates (often a pre-requisite for academic positions). Even then, most law students have multiple interests in selecting a law school, some less tangible than others - finding schools that stress teaching quality over scholarship, finding schools with clinical opportunites, finding schools renowned for the friendliness of their student body, etc. These sorts of considerations prevent the possibility of even creating individually-tailored law school rankings oneself. There is, and never will be, a ranking that any law school applicant should "go by." In broad stroked, the USNews rankings do correlate with the factor that most students are interested in - quality and availability of post-school opportunites (whether clerkships, academic positions, firm jobs, government work, public interest, etc). Use tools like LSN, chiashu, and the LSAC Calculator to determine the range of schools at which you will be competitive (T14, 19-35, 35-50, T2, T3, T4). Obviously, you will have reaches above this range and safeties below, but this is the heart of your search. Outside of the T14, start by eliminating any schools in areas that you would hate to live. Then think about the factors that are important to you, and do a little reserch on which schools have what you are looking for. While you will probably not attempt to put together a statisical model to rank your choices (most students don't), you will quickly come to group schools in varying levels of desireability. Apply to the desireable ones.
If people say that the us news ranking aren't accurate- then what rankings do you go by?